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Analog Devices Inc. LTC3834IUFD#TRPBF
- Part No.:
- LTC3834IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3834IUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,059
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Product details
Overview
LTC3834IUFD#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input synchronous step-down controller IC driving dual N-channel MOSFETs in buck converter topologies. It delivers precise 0.8V reference regulation (±1%), supports 4V–36V input, 0.8V–10V output, and operates with 30µA quiescent current - enabling long battery life in automotive and telecom power systems.
For engineers reviewing the LTC3834IUFD#TRPBF datasheet, LTC3834IUFD#TRPBF pinout, LTC3834IUFD#TRPBF application, or LTC3834IUFD#TRPBF equivalent, this page provides verified package mapping (20-pin 4mm × 5mm QFN), confirmed pin functions, OPTI-LOOP® compensation behavior, phase-lockable 140kHz–650kHz operation, and real-world soft-start/tracking implementation details.
Technical Context
The LTC3834IUFD#TRPBF implements a constant-frequency current-mode control architecture with integrated error amplifier, peak-current sensing via differential SENSE+/- inputs, and programmable light-load modes (Burst Mode®, pulse-skipping, or forced continuous). Its OPTI-LOOP® compensation minimizes required output capacitance by optimizing transient response across ESR and COUT variations.
It features dual gate drivers (TG/BG) with 70ns dead-time control, internal LDOs for INTVCC (5.25V/7.5V selectable via EXTVCC), and robust protection including output overvoltage lockout (±10% at VFB), current foldback limiting, and 99% duty-cycle dropout operation - all coordinated through a precision 0.8V reference and PGOOD monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and telecom -48V derived rails. |
| Output Voltage Range | 0.8V to 10V - adjustable via external resistor divider; ±1% accuracy enables tight regulation for FPGA/CPU core supplies. |
| Quiescent Current | 30µA - extends runtime in always-on battery-powered systems without compromising startup speed. |
| Switching Frequency | 140kHz to 650kHz (phase-lockable) - balances efficiency vs. size; allows synchronization across PolyPhase® multi-controller designs. |
| Gate Drive Capability | TG/BG outputs drive N-MOSFETs with 50ns rise/fall times (3300pF load); supports high-side bootstrapped and low-side ground-referenced switching. |
| Protection Features | Output overvoltage lockout (±10% at VFB), current foldback limiting, undervoltage lockout (3.7V), and thermal shutdown - ensures safe operation under fault conditions. |
| Package & Thermal | 20-pin 4mm × 5mm QFN (UFD) with exposed SGND pad; θJA = 37°C/W - enables compact, thermally efficient PCB layout. |
Pinout & Package
Package: 20-pin plastic QFN (4mm × 5mm), exposed thermal pad (Pin 21) soldered to SGND for thermal and electrical integrity. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH (Pin 1) | Error amplifier output / compensation node | Controls peak inductor current; voltage sets current limit threshold - critical for loop stability and transient response tuning. |
| TRACK/SS (Pin 2) | Soft-start and tracking input | Internal 1µA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider for supply tracking during power sequencing. |
| VFB (Pin 3) | Feedback input | Compares output voltage (via resistive divider) to 0.8V reference; ±1% accuracy ensures precise regulation under load and line variation. |
| SGND (Pin 4) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback and error amplifier paths. |
| PGND (Pin 5) | Power ground | Return path for bottom MOSFET source, Schottky anode, and input capacitor - requires low-inductance connection to minimize switching noise. |
| BG (Pin 6) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-ground; swing = 0V to INTVCC - enables high-efficiency low-side switching. |
| PGOOD (Pin 16) | Open-drain power-good indicator | Pulled low when VFB deviates >±10% from setpoint - used for system enable/disable sequencing and fault reporting. |
| PLLIN/MODE (Pin 17) | External sync input / light-load mode select | Accepts external clock (140–650kHz) for PLL synchronization; also selects Burst Mode® (GND), pulse-skipping (mid-voltage), or forced continuous (INTVCC). |
| PHASMD (Pin 18) | Phase modulation control | Adjusts CLKOUT phase relative to TG edge - enables precise interleaving in PolyPhase® multi-phase converters. |
| CLKOUT (Pin 19) | Open-drain clock output | Provides synchronized clock signal to daisy-chain additional controllers - essential for current-sharing and ripple cancellation in multi-phase designs. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitors (including low-ESR ceramics) without requiring complex type-II/type-III compensation networks. |
| Dual N-Channel MOSFET Drive | Integrated high- and low-side gate drivers eliminate need for external driver ICs - reduces BOM count and layout complexity in high-efficiency buck designs. |
| Adjustable Light-Load Operation | Selectable Burst Mode®, pulse-skipping, or forced continuous conduction - optimizes efficiency vs. noise/ripple trade-offs per application requirement. |
| 99% Duty Cycle Dropout | Enables operation with VIN as low as ~VOUT + 0.5V - critical for maintaining regulation in deep dropout conditions common in automotive cold-crank scenarios. |
| EXTVCC Power Input | Accepts external 4.7–10V supply to power INTVCC LDO - improves efficiency by bypassing lossy VIN-to-INTVCC conversion when auxiliary rail is available. |
Applications
| Automotive Infotainment Power | Telecom DC-DC Intermediate Bus |
|---|---|
|
Use Scenario: Powering DSPs, FPGAs, and display controllers in vehicle head units with 12V battery input and strict quiescent current limits. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3.3V/5V rails; manages soft-start sequencing and tracks auxiliary supplies during ignition cycles. Use Value: 30µA IQ extends standby time; 4V–36V input accommodates cold-crank (4.5V) and load-dump (36V); PGOOD enables safe processor reset coordination. |
Use Scenario: Generating 3.3V/5V intermediate bus from –48V telecom rectified supply in distributed power architectures. IC Role / Device Role / Timing Role: High-efficiency step-down controller driving discrete N-MOSFETs; synchronized via PLLIN/MODE to system clock for EMI reduction. Use Value: Phase-lockable 140–650kHz operation enables spread-spectrum and multi-phase interleaving; OPTI-LOOP® simplifies output cap selection for high-reliability telecom environments. |
| Battery-Powered Test Equipment | Industrial IoT Edge Node Supply |
|
Use Scenario: Portable oscilloscopes and multimeters requiring ultra-low standby power and fast wake-up from sleep mode. IC Role / Device Role / Timing Role: Main DC-DC controller with TRACK/SS-initiated soft-start and RUN-pin shutdown; operates in Burst Mode® below 10mA load. Use Value: 4µA shutdown IQ preserves battery charge; 30µA operating IQ enables >100-hour runtime on Li-ion; ±1% VOUT accuracy maintains measurement integrity. |
Use Scenario: Powering ARM Cortex-M microcontrollers, RF transceivers, and sensors in sealed industrial gateways with wide ambient temperature range. IC Role / Device Role / Timing Role: Robust buck controller with overvoltage protection, current foldback, and thermal-aware design for unattended operation. Use Value: –40°C to +85°C guaranteed operation; output OVP prevents damage to sensitive wireless modules; EXTVCC option improves efficiency when 5V auxiliary rail is present. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3833EUFD#TRPBF | Single-phase, no CLKOUT/PHASMD pins; lacks PolyPhase® support and PLL synchronization; same 4–36V input, 30µA IQ, and OPTI-LOOP®. | Not suitable for multi-phase or synchronized systems; ideal for cost-sensitive single-rail designs where phase control is unnecessary. | Choose LTC3833EUFD#TRPBF only if PolyPhase® capability and external clock sync are not required - saves pin count and simplifies layout. |
| MP2918GL-Z | Monolithic synchronous buck controller (integrated MOSFETs); 4.5–36V input; 100µA IQ; no EXTVCC or OPTI-LOOP®; fixed 500kHz frequency. | Lower component count but limited thermal performance and less flexible compensation; unsuitable for high-current or low-IQ applications. | Choose MP2918GL-Z only for space-constrained, medium-current (<10A) designs where integration outweighs efficiency and flexibility needs. |
Compared with LTC3833EUFD#TRPBF and MP2918GL-Z, the LTC3834IUFD#TRPBF uniquely combines PolyPhase® synchronization, EXTVCC efficiency optimization, and OPTI-LOOP® adaptive compensation - making it the preferred choice for high-reliability, multi-rail, and thermally demanding applications.
Availability
LTC3834IUFD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, telecom intermediate bus, and battery-operated digital devices requiring stable component supply, guaranteed industrial temperature operation, and long-term lifecycle support.
Supply support for LTC3834IUFD#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for all Linear power products including the LTC series.
The LTC3834IUFD#TRPBF belongs to Linear's high-performance synchronous controller family designed for efficiency-critical, wide-input DC-DC conversion in automotive, industrial, and communications infrastructure.
FAQ
What is the operating temperature range for the LTC3834IUFD#TRPBF?
The LTC3834IUFD#TRPBF is specified and guaranteed over –40°C to +85°C ambient temperature. This industrial-grade rating is confirmed in the manufacturer's ordering information table and applies to both electrical performance and thermal derating (θJA = 37°C/W). The device uses internal thermal shutdown protection and is qualified for use in automotive infotainment and telecom equipment where ambient extremes occur.
Does the LTC3834IUFD#TRPBF support external clock synchronization?
Yes, the LTC3834IUFD#TRPBF supports external clock synchronization via its PLLIN/MODE pin, with a guaranteed lock range of 140kHz to 650kHz. When an external clock is applied, the internal oscillator aligns the rising edge of the TG signal to the external clock's rising edge using the PLLLPF pin as the loop filter node. This capability is explicitly documented in the "Frequency Selection and Phase-Locked Loop" section of the datasheet.
How does the EXTVCC pin improve efficiency in the LTC3834IUFD#TRPBF?
The EXTVCC pin on the LTC3834IUFD#TRPBF allows an external 4.7V–10V supply to power the INTVCC LDO, bypassing the less-efficient VIN-to-INTVCC linear regulator. When EXTVCC exceeds 4.7V, the internal 5.25V LDO shuts off and a 7.5V LDO activates - reducing power loss in the bias supply chain. This is especially beneficial when powering INTVCC from a pre-regulated 5V rail, as confirmed in the Electrical Characteristics table and Applications Information section.
What protection features are built into the LTC3834IUFD#TRPBF?
The LTC3834IUFD#TRPBF includes output overvoltage protection (±10% trip at VFB), current foldback limiting during short circuits, undervoltage lockout (3.7V), thermal shutdown, and reverse-current prevention via RICMP. These protections are detailed in the Features list, Absolute Maximum Ratings, and Applications Information - ensuring safe operation during faults without requiring external circuitry.
Can the LTC3834IUFD#TRPBF operate in dropout mode, and what is its maximum duty cycle?
Yes, the LTC3834IUFD#TRPBF supports very low dropout operation with a guaranteed maximum duty cycle of 99.4%, enabling regulation when VIN approaches VOUT. This is achieved via internal dropout detection that forces periodic top-FET off-time to recharge the bootstrap capacitor - a behavior explicitly described in the "INTVCC/EXTVCC Power" and "Shutdown and Start-Up" sections of the datasheet.
LTC3834IUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 250kHz ~ 530kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x5)
LTC3834IUFD#TRPBF FAQ
1.How can I place an order for LTC3834IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834IUFD#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3834IUFD#TRPBF reliable?
The price and inventory of LTC3834IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3834IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834IUFD#TRPBF?
LTC3834IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834IUFD#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3834IUFD#TRPBF?
For technical support, including LTC3834IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3834IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3834IUFD#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3834IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3834IUFD#TRPBF?
All LTC3834IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834IUFD#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3834IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3834IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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